@article{GoicoecheaAlcaldeMediavillaetal.2002,
  author    = {Luis Julian Goicoechea and D. Alcalde and E. Mediavilla and J. A. Munoz and Rodrigo Gil-Merino},
  title     = {The nature and size of the optical continuum source in QSO 2237+0305},
  year      = {2002},
}